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Suppose that an object is moving with constant acceleration. Make a statement concerning its motion with respect to time.

In equal times it moves equal distances.

In equal times its speed increases by equal amounts.

In equal times its velocity changes by equal amounts.

A statement cannot be made using the information given.

Suppose a ball is thrown straight up. What is its acceleration just before it reaches its highest point?

Zero.

slightly greater than g.

Exactly g.

Slightly less than g.

An object is moving with constant non-zero velocity in the +x axis. The velocity versus time graph of this object is:

A parabolic curve.

A horizontal straight line.

A vertical straight line.

A straight line making an angle with the time axis.

Can an object have increasing speed while its acceleration is decreasing? Support your answer with an example.

Yes, and an example would be an object released from rest in the presence of air friction.

No, this is impossible because of the way in which acceleration is defined.

Yes, and an example would be an object falling in the absence of air friction.

No, because if acceleration is decreasing the object will be slowing down.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration.

The acceleration must be constantly increasing.

The acceleration must be a constant non-zero value.

The acceleration must be constantly decreasing.

The acceleration must be equal to zero.